Core Web Vitals (LCP, CLS, TBT), TTFB, a full request waterfall, a resource-weight breakdown, and a 10-user concurrent load test with p95 / p99 response times.
The test loads the page once in a headless browser to read its timing APIs, then issues a short burst of concurrent requests (10 virtual users × 5 requests) to the final URL to measure response time under light load. No exploitation, no authentication, no injection. You are the operator of every test you start and are solely responsible for holding permission to load-test the target. Scores are automated heuristics, not a verdict. See the Disclaimer, Privacy Policy and Terms before you run a test.
first party third party
50 requests0 errors38 req/s
Want the deep version? Our engineers profile back-end traces, database queries and cache behaviour under realistic sustained load — not a single burst.
Authorized targets only · 5 tests per IP per day · Need sustained load testing? Talk to our engineers.
The free test is a single-location snapshot. Our engagements profile the full path — origin, cache, database and third parties — under realistic sustained traffic.